Problem

Secure Relay was not listening on an HTTPS port and the following error was thrown in the te.log:

2026-06-23 08:22:49,108 - ERROR [Cluster Thread 6] (ManagedHttpServer) - Error initializing HTTPS 0.0.0.0:2543
java.lang.IllegalArgumentException: Cannot create HttpsServerSettings with null PersonalX509Certificate

Resolution

The certificate saved to the embedded server was removed from disk while it was still referenced in the database. To remedy this, re-import the certificate to the embedded server.